My partner has been trying to tighten up skin from GLP-1 weight loss (50+lbs) and we've been running SSA Glow 50 (BPC 5mg, TB 10mg, GHK 35mg), Ipamorelin, Tesamorelin. For me, I feel like MT-2 has also been improving my skin quality. Could just be the effect of tanning, but my skin feels better from the inside out since I've starting cycling MT-2.
Took a few weeks but we're both really starting to see progress. I only lost ~40 lbs but don't have loose skin to tighten up, more focused on building muscle back.
We also use a fair amount of injectable aminos, (Carnitine, LIPO-MIC, MA Motivator, B12, Super Human Blend, etc) and I feel these also have an indirect effect, likely through the increase in lipolysis.
Would defnitiely recommend adding supplemental collagen to your shake as well.